Ettobe bugatti



E. BUGATTI.

INTERNAL COMBUSTION ENGINE.

APPLICATION FILED APR. 15, I916.

1 3 1 6 ,420 Patented Sept. 16, 1919.

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'INTERNAL COMBUSTION ENGINE.

APPLICATION FILED APR. 15. l9l6.

Patented Sept. 16,- 1919.

2 SHEETS-SHEET 2.

ETTORE BUG-ATTI, F PARIS, FRANCE.

INTERNAL-COMBUSTION ENGINE.

Specification of Letters Patent.

Patented Sept. 16, 1919.

Application filed April 15, 1916. Serial No. 91,505.

- To all whom it may concern:

Be it known that I, E'rronr. BUGA'ITI, a subject of the King of Italy, residing in Paris, France, have invented certain new and useful Improvements in Internal-Combustion Engines, of which the*following is a.

specification. I

The object of this invention'is a method of manufacture of steel cylinders for internal combustion engines with water circulation.

Heretofore the manufacture of this type of cylinders has given rise to complications which render it impossible to make them in series. Auto enous welding, brazing with silver and wriding with tin have been most frequently resorted to for the purpose of joining the water jacket to the cylinder, and these processes require tedious and delicate work.

The method of manufacture which forms the subject of this invention consists in putting on a separate jacket of sheet iron or any other suitable metal having the shape of a hood of square, rectangular or other section, which covers one or more cylinders on all sides from the top downward, and bears against a kind of frame of corresponding shape made in one piece with the upper part of the cylinder with which it is connected by the valve casings. The lower end of the hood forming jacket is secured to the cylinder either by a flange bearing against a flange of the cylinderthe whole being capable of being joined to the crank case by any suitable means-or by a freely expansible joint as described below. 7

A modification of the method of manufacture indicated above consists in providing the body of the cylinder alone with a jacket or casing connected with it by a longitudinal joint and freely expansible water-tight jolnts at each of its ends, the head of such cylinder having its water jacket cast in one with 1t.

The below description referring to the annexed drawing, given by way of example,

will explain the mannerin which the method of manufacture of such cyllnder or cylmders is carried out.

Figure 1 shows the cylinder in one-half of the figure in vertical section on line X-X of Fig. 3, and in the other half in elevation i with the jacket in section.

Fig. 2 shows said cylinder in one half in yertical section on line YY of Fig. 3- i. a, in a plane perpendicular to the plane XX, and in the other half in elevation with the acket in section.

Fig. 3 is a plan showing in one half a horizontal section on line ZZ of Fig. 2', and in the other half the upper part of the cylinder with the jacket in section.

Fig. 4 shows in elevation two identical cylinder joined together.

Fig. 5 is a plan of two cylinders joined together and having a common jacket or casing, as in Fig. 4.

Fig. 6 shows in elevation a cylinder with the casing in section put on in accordance with the modification.

Fig. 7 is a horizontal section on line VV of Fig. 6.

Fig. 8 is a fragmentary vertical section on a larger scale, being a detail of part of Fig. 6.

In the upper part of the steel cylinder at is formed a square frame Z which is integral with the valve casings 0, such square frame 'being suitably machined on its four sides and at its upper edges. Over said square frame is drawn and on it rests the sheet metal jacket d having the shape of a hood likewise of square section; and joints are obtained by the ground faces of the valve guides and of the spark-plug opening e, as well as by the ports in of the admission and exhaust pipes of the valve casings. Said jacket terminates at its lower end in a flange '7 which is capable of being bolted, with the interposition of a packing forming a tight joint, to the flange g of square shape integral with the cylinder a. Said flange may also serve the of securing the cylinder together wlth the jacket to the crank case of the motor.

In the construction of steel cylinders with water circulation the valve casings are as a rule attached and not cooled, which is not necessary in the above described method of 'by bolts or other means, or they may be brazed or welded. The jacket (1 is in that case of rectangular section.

The frame which is formed by the valve casings constitutes a very rigid base, adapt- 1 ed to secure theretothe cam shaftwith the valve-operating mechanism. In Fig. 6 the separate outer casing 41 ternunates at the bottom in a straight part Z which engages in a groove m (Fig. 8) passing all around the flange g of the cylinder a.

Water-tightness between the parts a and 03 is insured by a compressible cord packing 'It capable of being compressed at will by the;

bolts 0 which act on the independent clamping flange p.

In this manner a perfectly tight freely expansible joint is insured which is capabieof being easily inspected without the necesslty of removing the entirejacket d but merely the independent flange p.

A very important advantage of this method of construction .is that it requires no welding nor screw joint between the explosion chamber and the gas passages or casings at the outlet. oi the valves, the whole device being made in one piece.

Moreover, the attaching of the cylinders to one-another for the purpose of forming a single body is effected in such a manner as to cause no deformation of the cylinders.

Y According to the construction of Figs. 6 and 7 the head 6 of the cylinder a is no longer covered by the attached casing or jacket d. The water jacket of the head I) is cast in one with it, and only the body of the cylinder a is provided with the casing d which is opened along the rib g, Figs. 6 and 7, for the purpose of being slipped over the body of the cylinder between the end flanges 9'. When said casing d has been put in place its two ends are secured to the longitudinal. rib 1", provided with circulation apertures 1", by means of the clip 8 and screws t, with some material a interposed which will insure a good longitudinal joint of the casing. At the two ends Z of the casing d a cord at which passes all around, is pressed by the twp-part flange p and bolts 0 against both the casing d and flanges 9, thereby insuring a freely expansible and absolutely tight joint between the separate casing and the body of the cylinder, so that the circulation of the water takes place without leakage in the water jacket cast in one with the head of the cylinder and in the water jacket obtained by the separate casing formmg a continuation of the former jacket.

11 Fig. 5 the casing d common to the two connected cylinders a of Fig. 4 is slipped on, as in Fig. 6, between the end flanges of the cylinders, and then closed alo the longitudinal rib g. The heads and ases of the casting and a sheet-metal jacket, the jacket formed as a hood having substantially parallel sides or walls suficiently larger than the cylinder to afford the requisite water space between, and the cylinder casting having a projecting portion above the cylinder head extending outwardly beyond the cylinder walls and substantially filling the jacket, whereby the latter is located.

2. The structure of claim 1, further characterized in that the projecting portion above the cylinder head is formed with valve chambers and with communica' inlet and outlet openings, and the jacket has openings coinciding therewith.

3..A jacketed cylinder for an internal combustion engine, comprisin a cylinder casting and a sheet-metal jac et inclosing such casting and spaced apart therefrom, the cylinder casting having a rib extending longitudinally along one side and the jacket formed with an open joint along said side, combined with means for clamping its approaching edges at such joint to said rib.

4. A jacketed cylinder for an internal combustion engine, comprisin a cylinder casting and a sheet-metal jac et inclosing such casting and spaced apart therefrom, the cylinder casting having a rib extending longitudinally along one side with its outer face in the plane of said jacket and the jacket formed with its edges approaching each other and lying flat against the outer face of said ri and clampingmeans, for securing such edges 'to said rib.

'5. A jacketed cylinder for an internal combustion engine, comprising a cylinder casting having an end flange, a sheet-metal jacket surrounding the cylinder, a compressible packing at the junction of the jacket and flange, and a clamping ring surrounding the end of the jacketand inclosing such packing, with means for tightening such ring in place to compress the packing against the jacket and flange.

6. A jacketed cylinder accordin to claim 5, further characterized in that tile clamping is internally beveled to form a triangular annular chamber wherein the packing is confined.

7. A jacketed cylinder according to claim 5, further characterized in that the packing is in the form of an annular cord of ap proximately circular cross-section, and the clamping ring is internally beveled to form a triangular annular chamber within which the pacldng ring is confined, whereby the tightening of the clamping ring longitudinally of the cylinder compresses the packing both inwardly against the jacket and end- 10 wise against the flange.

In witness whereof I have hereunto s' ed my name in the presence of two subscri ing witnesses.

ETTORE BUGATTI. Witnesses:

' CHAS. P. PBESSLY, HENRI CARTIER. 

